Cobalt blue

Shades of blue Indigo Blue
Infinite Construction - STEAM
Cobalt blue
 
Cobalt Blue.JPG
A sample of a commercial cobalt blue pigment
About these coordinates     Color coordinates
Hex triplet#0047AB
sRGBB  (rgb)(0, 71, 171)
CMYKH   (c, m, y, k)(100, 58, 0, 33)
HSV       (h, s, v)(215°, 100%, 67%)
Source[Unsourced]
ISCC–NBS descriptorVivid blue
B: Normalized to [0–255] (byte)
H: Normalized to [0–100] (hundred)
Cobalt blue
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.100.107
EC Number
  • 310-193-6
Properties
Al2CoO4
Molar mass 176.892 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Cobalt blue is a blue pigment made by sintering cobalt(II) oxide with Aluminum(III) Oxide (alumina) at 1200 °C. Chemically, cobalt blue pigment is cobalt(II) oxide-aluminium oxide, or cobalt(II) aluminate, CoAl2O4. Cobalt blue is lighter and less intense than the (iron-cyanide based) pigment Prussian blue. It is extremely stable and historically, has been used as a coloring agent in ceramics (especially Chinese porcelain), jewelry, and paint. Transparent glasses are tinted with the silica-based cobalt pigment smalt.

Historical uses and production

Cobalt blue in impure forms had long been used in Chinese porcelain.[1] The first recorded use of cobalt blue as a color name in English was in 1777.[2] It was independently discovered as a pure alumina-based pigment by Louis Jacques Thénard in 1802.[3] Commercial production began in France in 1807. The leading world manufacturer of cobalt blue in the nineteenth century was Benjamin Wegner's Norwegian company Blaafarveværket ("blue colour works" in Dano-Norwegian). Germany also was famous for production of it, especially the blue colour works (Blaufarbenwerke) in the Ore Mountains of Saxony.

In human culture

Art

Automobiles

Construction

Sports

Vexillology

Video games

Toxicity

Cobalt blue is toxic when inhaled or ingested. Potters who fail to take adequate precautions when using cobalt blue may succumb to cobalt poisoning.

See also

References

  1. ^ Kerr, Rose; Wood, Nigel (2004), Science and Civilisation in China Volume 5. Part 12, Ceramic Technology, Cambridge: Cambridge University Press, pp. 658–692, ISBN 0-521-83833-9.
  2. ^ Maerz and Paul. A Dictionary of Color. New York (1930). McGraw-Hill. p. 91; Color Sample of Cobalt Blue: Page 131 Plate 34 Color Sample L7
  3. ^ Gehlen, A.F. (1803). "Ueber die Bereitung einer blauen Farbe aus Kobalt, die eben so schön ist wie Ultramarin. Vom Bürger Thenard". Neues allgemeines Journal der Chemie, Band 2. H. Frölich. Archived from the original on 2018-02-10. German translation from Thénard, L.J. (1803 (Brumaire, XII)), "Considérations générales sur les couleurs, suivies d'un procédé pour préparer une couleur bleue aussi belle que l'outremer" (PDF), Journal des Mines, 86: 128–136, archived (PDF) from the original on 2012-03-29 Check date values in: |year= (help).
  4. ^ "Chinese pottery: The Yuan dynasty (1206–1368)". Archived 2017-12-29 at the Wayback Machine Encyclopædia Britannica Online. Accessed 7 June 2018.
  5. ^ ""J Varley's List of Colours". The British Museum. Archived from the original on 2016-09-20. Retrieved 2016-07-22.
  6. ^ "Cobalt blue". ColourLex. Archived from the original on 2015-04-15. Retrieved 7 June 2018.
  7. ^ "Real Salt Lake unveil new primary kit for 2018". MLSSoccer.com. February 8, 2018. Retrieved June 26, 2019.
  8. ^ "History". SportingKC.com. Retrieved June 26, 2019.
  9. ^ Sheffield, Brandon. "Out of the Blue: Naoto Ohshima Speaks". Gamasutra. Archived from the original on 16 July 2015. Retrieved 12 August 2013. Well, he's blue because that's Sega's more-or-less official company color